<template>
  <div>
    <!-- 面包屑导航区域 -->
    <el-breadcrumb separator-class="el-icon-arrow-right">
      <el-breadcrumb-item :to="{ path: '/home' }">首页</el-breadcrumb-item>
      <el-breadcrumb-item>权限管理</el-breadcrumb-item>
      <el-breadcrumb-item>角色列表</el-breadcrumb-item>
    </el-breadcrumb>

    <!-- 卡片视图 -->
    <el-card>
      <!-- 添加角色按钮区 -->
      <el-row>
        <el-button type="primary" @click="addDialogVisible = true"
          >添加角色</el-button
        >
      </el-row>
      <!-- 角色列表区域 -->
      <el-table :data="rolesList" style="width: 100%" border stripe>
        <!-- 展开列 -->
        <el-table-column type="expand">
          <template slot-scope="scope">
            <div v-if="scope.row.children.length === 0">
              该角色暂未被分配权限哦~
            </div>
            <el-row
              v-else
              :class="['bdbottom', i1 === 0 ? 'bdtop' : '', 'vcenter']"
              v-for="(item1, i1) in scope.row.children"
              :key="item1.id"
            >
              <!-- 渲染一级权限 -->
              <el-col :span="5">
                <el-tag
                  closable
                  @close="removeRightById(scope.row, item1.id)"
                  >{{ item1.authName }}</el-tag
                >
                <i class="el-icon-caret-right"></i>
              </el-col>
              <!-- 渲染二级权限 -->
              <el-col :span="19">
                <!-- 通过for循环嵌套渲染二级权限 -->
                <el-row
                  v-for="(item2, i2) in item1.children"
                  :key="item2.id"
                  :class="[i2 !== 0 ? 'bdtop' : '', 'vcenter']"
                >
                  <el-col :span="6">
                    <el-tag
                      type="success"
                      closable
                      @close="removeRightById(scope.row, item2.id)"
                      >{{ item2.authName }}</el-tag
                    >
                    <i class="el-icon-caret-right"></i>
                  </el-col>
                  <el-col :span="18">
                    <el-tag
                      type="warning"
                      v-for="item3 in item2.children"
                      :key="item3.id"
                      closable
                      @close="removeRightById(scope.row, item3.id)"
                      >{{ item3.authName }}</el-tag
                    >
                  </el-col>
                </el-row>
              </el-col>
            </el-row>
            <pre>
      <!-- {{ scope.row.children }} -->
      </pre>
          </template>
        </el-table-column>
        <!-- 索引列 -->
        <el-table-column type="index"> </el-table-column>
        <el-table-column prop="roleName" label="角色名称"> </el-table-column>
        <el-table-column prop="roleDesc" label="角色描述"> </el-table-column>
        <el-table-column label="操作" width="300px">
          <template slot-scope="scope">
            <el-button
              size="mini"
              type="primary"
              icon="el-icon-edit"
              @click="showEditDialog(scope.row.id)"
              :lst="scope.row.id"
              >编辑</el-button
            >
            <el-button
              size="mini"
              type="danger"
              icon="el-icon-delete"
              @click="removeRoleById(scope.row.id)"
              >删除</el-button
            >
            <el-button
              size="mini"
              type="warning"
              icon="el-icon-setting"
              @click="showSetRightDialog(scope.row)"
              >分配权限</el-button
            >
          </template>
        </el-table-column>
      </el-table>
    </el-card>

    <!-- 添加角色的对话框 -->
    <el-dialog
      title="添加角色"
      :visible.sync="addDialogVisible"
      width="50%"
      @close="addDialogClosed"
    >
      <!-- 内容主体区 -->
      <el-form
        :model="addForm"
        :rules="addFormRules"
        ref="addFormRef"
        label-width="80px"
      >
        <el-form-item label="角色名称" prop="roleName">
          <el-input v-model="addForm.roleName"></el-input>
        </el-form-item>
        <el-form-item label="角色描述" prop="roleDesc">
          <el-input
            v-model="addForm.roleDesc"
            type="textarea"
            :rows="3"
          ></el-input>
        </el-form-item>
      </el-form>
      <!-- 底部区 -->
      <span slot="footer" class="dialog-footer">
        <el-button @click="addDialogVisible = false">取 消</el-button>
        <el-button type="primary" @click="addRole">确 定</el-button>
      </span>
    </el-dialog>

    <!-- 编辑对应角色的对话框 -->
    <el-dialog title="编辑角色" :visible.sync="editDialogVisible" width="50%">
      <el-form
        :model="editForm"
        :rules="editFormRules"
        ref="editFormRef"
        label-width="100px"
      >
        <el-form-item label="角色名称" prop="roleName">
          <el-input v-model="editForm.roleName"></el-input>
        </el-form-item>
        <el-form-item label="角色描述">
          <el-input
            v-model="editForm.roleDesc"
            type="textarea"
            :rows="3"
          ></el-input>
        </el-form-item>
      </el-form>
      <span slot="footer" class="dialog-footer">
        <el-button @click="editDialogVisible = false">取 消</el-button>
        <el-button type="primary" @click="editRoleInfo(editForm.roleId)"
          >确 定</el-button
        >
      </span>
    </el-dialog>

    <!-- 分配权限的对话框 -->
    <el-dialog
      title="分配权限"
      :visible.sync="setRightDialogVisible"
      width="50%"
      @close="setRightDialogClosed"
    >
      <el-tree
        :data="rightsList"
        :props="treeProps"
        show-checkbox
        node-key="id"
        default-expand-all
        :default-checked-keys="defKeys"
        ref="treeRef"
      ></el-tree>
      <span slot="footer" class="dialog-footer">
        <el-button @click="setRightDialogVisible = false">取 消</el-button>
        <el-button type="primary" @click="allotRights()">确 定</el-button>
      </span>
    </el-dialog>
  </div>
</template>

<script>
export default {
  data() {
    return {
      // 角色列表
      rolesList: [],
      // 控制添加角色对话框的显示和隐藏
      addDialogVisible: false,
      // 添加角色的表单数据
      addForm: {
        roleName: '',
        roleDesc: ''
      },
      // 添加表单的验证规则对象
      addFormRules: {
        roleName: [
          { required: true, message: '请输入角色名称', trigger: 'blur' },
          {
            min: 2,
            max: 10,
            message: '角色名的长度在2~10个字符之间',
            trigger: 'blur'
          }
        ]
      },
      // 控制编辑角色对话框的显示和隐藏
      editDialogVisible: false,
      // 查询到的对应角色信息对象
      editForm: {},
      editFormRules: {
        roleName: [
          { required: true, message: '请输入角色名称', trigger: 'blur' },
          {
            min: 2,
            max: 10,
            message: '角色名的长度在2~10个字符之间',
            trigger: 'blur'
          }
        ]
      },
      // 控制分配权限对话框的显示和隐藏
      setRightDialogVisible: false,
      // 获取所有权限数据(树形结构)
      rightsList: [],
      treeProps: { children: 'children', label: 'authName' },
      // 默认选中的节点id
      defKeys: [],
      // 当前分配权限的角色Id
      roleId: ''
    }
  },
  created() {
    // 获取角色列表
    this.getRolesList()
  },
  methods: {
    // 获取角色列表
    async getRolesList() {
      const { data: res } = await this.$http.get('roles')
      if (res.meta.status !== 200) {
        return this.$message.error(res.meta.msg)
      }
      this.rolesList = res.data
      console.log(this.rolesList)
    },
    // 点击按钮添加角色
    addRole() {
      // console.log(this.addForm) // 这里有个问题：显示的是重置后的值，屏蔽掉下面那一句又能获得正确的值
      // 发送请求前，进行表单预校验
      this.$refs.addFormRef.validate(async (valid) => {
        // console.log(valid)
        // 检验不通过，不发请求，对话框不关闭
        if (!valid) return
        const { data: res } = await this.$http.post('roles', this.addForm)
        console.log(res)
        // 关掉后会重置表单数据(请求发送后进行重置)
        this.addDialogVisible = false
        if (res.meta.status !== 201) {
          return this.$message.error('添加角色失败! ' + ' ' + res.meta.msg)
        }
        this.$message.success('添加角色成功！')
        // 重新获取角色列表数据
        this.getRolesList()
      })
    },
    // 监听添加用户对话框的关闭事件
    addDialogClosed() {
      // 重置回之前的状态
      this.$refs.addFormRef.resetFields()
    },
    // 展示编辑角色的对话框
    async showEditDialog(id) {
      // console.log(id)
      const { data: res } = await this.$http.get('roles/' + id)
      // console.log(res)
      if (res.meta.status !== 200) {
        return this.$message.error('查询用户信息失败！' + ' ' + res.meta.msg)
      }
      this.editForm = res.data
      this.editDialogVisible = true
      console.log(this.editForm)
    },
    // 修改角色信息并提交
    editRoleInfo(id) {
      // console.log(id)
      // 修改角色也要对表单进行验证再发请求
      this.$refs.editFormRef.validate(async (valid) => {
        if (!valid) return
        const { data: res } = await this.$http.put('roles/' + id, this.editForm)
        this.editDialogVisible = false
        if (res.meta.status !== 200) {
          return this.$message.error('修改角色失败! ' + ' ' + res.meta.msg)
        }
        this.$message.success('修改角色成功！')
        // 重新获取角色列表数据
        this.getRolesList()
      })
    },
    // 根据Id删除对应的角色信息
    async removeRoleById(id) {
      // 弹框询问用户是否删除数据
      const confirmResult = await this.$confirm(
        '此操作将永久删除该用户, 是否继续?',
        '提示',
        {
          confirmButtonText: '确定',
          cancelButtonText: '取消',
          type: 'warning'
        }
      ).catch((err) => err)

      // 如果用户确认删除，则返回值为字符串 confirm
      // 如果用户取消了删除，则返回值为字符串 cancel
      // console.log(confirmResult)
      if (confirmResult !== 'confirm') {
        return this.$message.info('已取消删除')
      }

      const { data: res } = await this.$http.delete('roles/' + id)

      if (res.meta.status !== 200) {
        return this.$message.error('删除用户失败！' + ' ' + res.meta.msg)
      }

      this.$message.success('删除用户成功！')
      this.getRolesList()
    },
    // 根据id删除对应权限
    async removeRightById(role, rightId) {
      const confirmResult = await this.$confirm(
        '此操作将永久删除该权限, 是否继续?',
        '提示',
        {
          confirmButtonText: '确定',
          cancelButtonText: '取消',
          type: 'warning'
        }
      ).catch((err) => err)
      console.log(confirmResult)
      if (confirmResult !== 'confirm') {
        return this.$message.info('取消了删除')
      }
      const { data: res } = await this.$http.delete(
        `roles/${role.id}/rights/${rightId}`
      )
      if (res.meta.status !== 200) {
        return this.$message.error(res.meta.msg)
      }
      // console.log(res.data)
      // 删除权限成功后会返回该角色的最新权限，所以不建议重新获取全部的角色信息
      // this.getRolesList() //不建议调这个接口

      // 我们拿到了具体的这条角色信息，就可以为他重新赋值
      role.children = res.data
    },
    // 展示分配权限的对话框
    async showSetRightDialog(role) {
      // 在这里拿到角色Id
      this.roleId = role.id
      // console.log(role)
      // 首先获取所有权限列表
      const { data: res } = await this.$http.get('rights/tree')
      if (res.meta.status !== 200) {
        return this.$message.error(res.meta.msg)
      }
      this.rightsList = res.data
      // console.log(this.rightsList)
      this.getLeafKeys(role, this.defKeys)
      this.setRightDialogVisible = true
    },
    // 递归获取三级权限的id
    getLeafKeys(node, arr) {
      if (!node.children) {
        return arr.push(node.id)
      }
      node.children.forEach((item) => {
        this.getLeafKeys(item, arr)
      })
    },
    // fix:关闭树形结构对话框时，清空默认选中的三级权限id列表
    setRightDialogClosed() {
      this.defKeys = []
    },
    // 点击确定为角色分配权限
    async allotRights() {
      const keys = [
        ...this.$refs.treeRef.getCheckedKeys(),
        ...this.$refs.treeRef.getHalfCheckedKeys()
      ]
      // console.log(keys)
      const idStr = keys.join(',')
      // console.log(idStr)
      const { data: res } = await this.$http.post(
        `roles/${this.roleId}/rights`,
        {
          rids: idStr
        }
      )
      if (res.meta.status !== 200) {
        return this.$message.error(res.meta.msg)
      }
      this.$message.success('分配权限成功')
      this.getRolesList()
      this.setRightDialogVisible = false
    }
  }
}
</script>

<style lang="less" scoped>
.el-tag {
  margin: 7px;
}

.bdtop {
  border-top: 1px solid #eee;
}

.bdbottom {
  border-bottom: 1px solid #eee;
}

.vcenter {
  display: flex;
  align-items: center;
}
</style>
